Nannini M A, Juliano S A
Department of Biological Sciences, Illinois State University, Normal 61790-4120, USA.
J Med Entomol. 1997 Jul;34(4):457-60. doi: 10.1093/jmedent/34.4.457.
Newly hatched Toxorhynchites rutilus (Coquillet) were added to experimental populations of Aedes triseriatus (Say) at varying days after prey hatch to test the hypothesis that a developmental asynchrony of Ae. triseriatus and Tx. rutilus leads to escape from predation by Ae. triseriatus in small water bodies. Presence of Tx. rutilus significantly affected prey survivorship. Regression of survivorship [log10 (x + 1) transformed] versus days head start for prey yielded a small, but significant positive slope, indicating that survivorship increased slightly with an increasing number of days head start. For females, mean weight at emergence was not significantly affected by treatments; however, median days to emergence differed significantly between the treatments, with females taking significantly longer to emerge with Tx. rutilus absent than when the predator was present. For males, neither mean mass nor median days to emergence was significantly affected by treatments. Treatments had no significant effect on the frequency of deaths or on mean weight of Tx. rutilus. Thus, a developmental asynchrony between Tx. rutilus and Ae. Triseriatus appears to have no effects on the predator, but does have a weak effect on prey performance at high hatch densities.
在猎物孵化后的不同天数，将新孵化的华丽巨蚊（Coquillet）添加到三带喙库蚊（Say）的实验种群中，以检验以下假设：三带喙库蚊和华丽巨蚊的发育不同步会导致三带喙库蚊在小水体中逃避被捕食。华丽巨蚊的存在显著影响了猎物的存活率。猎物存活率（经log10(x + 1)转换）与提前天数的回归分析得出一个小但显著的正斜率，表明随着提前天数的增加，存活率略有增加。对于雌性，羽化时的平均体重不受处理的显著影响；然而，处理之间羽化的中位数天数有显著差异，没有华丽巨蚊时雌性羽化所需的时间明显长于有捕食者时。对于雄性，羽化时的平均质量和中位数天数均不受处理的显著影响。处理对华丽巨蚊的死亡频率或平均体重没有显著影响。因此，华丽巨蚊和三带喙库蚊之间的发育不同步似乎对捕食者没有影响，但在高孵化密度下对猎物表现有微弱影响。
